<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>sessionstorage</title>
</head>

<body>
	<h2>sessionStorage</h2>
	<button onclick="saveData()">点我保存一个数据</button>
	<button onclick="readData()">点我读取一个数据</button>
	<button onclick="deleteData()">点我删除一个数据</button>
	<button onclick="deleteAllData()">点我清空一个数据</button>

	<script type="text/javascript">
		let p = { name: '张三', age: 18 }

		function saveData() {
			sessionStorage.setItem('msg', 'hello!!!')
			sessionStorage.setItem('msg2', 666)
			sessionStorage.setItem('person', JSON.stringify(p))
		}
		function readData() {
			console.log(sessionStorage.getItem('msg'))
			console.log(sessionStorage.getItem('msg2'))

			const result = sessionStorage.getItem('person')
			console.log(JSON.parse(result))
			console.log(sessionStorage.getItem('msg3'))
		}
		function deleteData() {
			sessionStorage.removeItem('msg2')
		}
		function deleteAllData() {
			sessionStorage.clear()
		}
	</script>
</body>

</html>